Editing shapes

To edit an object, first click on its stroke path to select it :

if this object is a single
object, its anchor points transform to small squares ;

if this object is a group
of objects, and
button isn't active, group's end-points are displayed instead (this
allows you to scale the entire group content); if this button's
active, you can edit inwards object end-points separately;

You can move a particular anchor point by clicking on it and
dragging the mouse, or you can translate the whole selection by
clicking somewhere on a stroke path. When moving a group of
object, the clicked object serves as a reference for alignment
on the grid.

If you want precise control over the object location,
pressing F2 directly pops up a properties panel
that lets you alter the object shape using numerical entries rather than the mouse

Context menu

Right-clicking on an object raises a popup menu
which lets you do various operations on that object. More
operations (e.g. rotations, ...) should be available in future
releases.

Resizing rectangles, ellipses and arcs

Pressing the CONTROL key during a resize-operation leaves the centre fixed.

Adding points to polygons

Pressing the CONTROL key when the mouse hovers on a polygon stroke-path,
allows to add/remove points to/from the polygon.

Multiple selections and groups

You can afford multiple selections either by holding the
SHIFT key pressed during the select operation or by "wrapping"
objects you want to select in a selection rectangle that you create by
dragging the mouse from anywhere on the sheet. Translation and
scaling operations are then possible using the same rules as
in the previous paragraph. You can also group selected objects
so that they get linked one to each other ; besides, groups are
nestables. To ungroup previously grouped objects, click with
the right mouse button somewhere on a selected group to raise
a popup menu, then select the ungroup operation.

Changing attributes

Graphical attributes, e.g. line thickness, fill colour, etc... can be changed by first
selecting objects of interest, then changing fields values in the floating Attribute Editor
palette.

Depending on the current content-type, some attributes aren't displayed, though they can be changed
in the Attribute Editor. In particular, the LaTeX picture environment content-type supports only a
very limited subset of all the attributes available in the palette (e.g. no colour, no texture, only
simple arrows, no shadow,...).
If you'd like to use the whole gamus of graphical attributes offered by the palette, including shadows,
texture and colour filling, or fine-grained dashing, please switch to the PsTricks content-type, and
add an \usepackage{pstricks.sty} in your LaTeX files. You won't regret it !